(Topic ID: 268002)

Bally 6803 Motordome mysteries, motorcycle mechanic apply inside please

By Atari_Daze

3 years ago

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6 posts
2 Pinsiders participating
Latest reply 3 years ago by frunch
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Motordome Bally, 1986

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So as I mentioned in another topic, I enjoy restoring these often more than playing them. That said, I recently sold a Motordome I restored and the new owner has a couple issue that I did not notice prior to sale. So yes, shame on me for not playing it more after I rebuilt it. Ok, the shame of that out of the way, here is where I'm asking for seasoned Motordome mechanic's to help. I've searched on here, pinwiki and pinrepair.com for these items but a cursory search did not find anything.
Issue 1, ball hangs at the upper right flipper. The wire guide was re-installed after restore, is there any service bulletin I don't have maybe that addresses this or is it just something one has to live with? Narrow the gap of the flipper bat?
Issue 2, problems selecting the skill levels. Again, maybe the only thing I did not try in the dozen or so games I played after I rebuilt the machine. Further, I cannot attest to this feature working before rebuild. It does have an aftermarket MPU, are there some jumpers that might need adjustment?

Thanks Pinside

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mid-day crowd bump, any experts on 6803 games?
Is this thing on?

Evening crowd thoughts?
Inability to set skill level perhaps caused by bad switch cap or diode on flipper switch? Can't recall if it has both.
Would that cause any flipper issues as there appear to be none.

Could be as simple as a broken wire at one of the switches on the same row or column as the non-working switches. Check the wiring and diode to each of the switches on the chart a bit further below. Give a tug to each wire and diode to be sure they're firmly attached. Hopefully you'll find something broke off, and reattaching is the solution.

Beyond that, did you replace the caps on all the switch matrix switches that use them? Sometimes a bad cap on one switch can cause weird behaviour for other switches on the matrix. Looking at the schematic, i see a cap installed on the left flipper switch:355324339.png

...but it's not going to be on the left flipper cabinet switch itself--that's a higher voltage switch in the flipper coil's circuit and is *not* on the switch matrix. It's probably a second switch stacked next to the cabinet switch, not sure as I've never worked on one of these. The switch in question is a low voltage switch and if it gets mixed up with the higher voltage flipper switches, you can damage some switch matrix stuff so be sure to keep them properly isolated from each other. Find the cap on that switch (if it's still there, sometimes caps get removed and don't get replaced for whatever reason), verify the legs from the cap aren't shorting to anything nearby. Take a couple pics for reference and cut off one leg from the cap to see if that corrects the problem. If it does, the cap can be left off for now, but should be replaced to function as designed. 0.047 or 0.05 uf/50v ceramic caps. Not sure what purpose it serves on that particular switch, nor why there would only be one on the left cab switch and not the right one. The switch caps are typically used to help mpu detect quick switch hits, most often used on rollovers and stand-up targets where a fast activation could be missed by the circuitry.

If everything looks good there, you may have to investigate the rest of the switch matrix and verify the rest of the switch caps, diodes, and wiring the same way...

Quoted from frunch:
Could be as simple as a broken wire at one of the switches on the same row or column as the non-working switches.

Quoted from frunch:
but it's not going to be on the left flipper cabinet switch itself

I think it is going to be more simple that that, and on the right flipper. In looking at before and after rebuild photos, I think I inadvertently installed a single leaf switch, thus the feature of selecting the skill level, via the second stack, is inoperable.

Lol, that'll do it

At least you got it figured out!

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